Filter  >  Water filter  >  water filter for hard water predection

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Pure water, optimal solutions - achieving perfect water treatment with Kwerk GmbH

Our RFSP-Plus scale protection filter with activated carbon combines advanced technology with a 3-stage filtration system to provide you with effective scale protection, high-performance filtration, and germ reduction. Thanks to our innovative filter solution, you can obtain optimal water for your needs in various applications, such as residential areas, gastronomy, medical practices, as well as commercial and industrial environments.

Scale Protection:

With our environmentally friendly SP3 scale protection granules, we offer you long-lasting and reliable protection against scale deposits. This not only reduces cleaning effort and costs for maintenance and repairs but also prolongs the lifespan of your systems. Our scale protection solution ensures that you no longer have bothersome lime residues on fixtures, tiles, or other surfaces.


Our RFSP-Plus filter consists of high-quality activated carbon powder that ensures efficient water filtration. Sediments, heavy metals, organic compounds, and chlorine are naturally removed or reduced. This not only improves the odor and taste of the treated water but also provides you with the highest level of water quality.

Germ Reduction:

Through our RFSP-Plus scale protection filter, not only is scale repelled, but also the formation of germs is reduced. This contributes to ensuring hygienic water quality and protects your health.

As a B2B platform, Kwerk GmbH not only offers you high-quality products but also comprehensive service. Our experts are here to assist you in finding the optimal water treatment solution for your company. We provide tailor-made solutions that are customized to your specific requirements.

Trust in the quality and reliability of our RFSP-Plus scale protection filter with activated carbon. Our products are made from high-quality materials such as activated carbon, synthetic catalyst material, PE end caps, PE nets, and Buna-N seals. They are characterized by a high operating temperature range from 2°C to 45°C and offer you long-term reliable performance.

Discover the benefits of our RFSP-Plus scale protection filters and optimize your water treatment with Kwerk GmbH, your trusted partner for effective solutions. Contact us today and let our experts guide you.


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Plastic pipe systems

Overview of plastic pipe systems
Technical information on ABS pipe systems
Technical information on PVC  U pipe systems
Technical information on PVC  U transparent pipe systems
Technical information on PVC  C pipe systems
Technical information on PP pipe systems
Technical information on PP-R pipe systems
Technical information on PE pipe systems
Technical information on PVDF pipe systems

Chemiedur - pipe

Technical information on UP-GF (FRP) pipe systems
UP-GF (FRP) pipes
UP-GF (FRP) molded parts and connection
UP-GF-PP (FRP) molded parts and connection
UP-GF (FRP) adhesive collars
UP-GF (FRP) loose flanges
Pot Strainer DN 200 - DN 500 Inliner PP/FRP Coated
Pot Strainer DN 200 - DN 500 Inliner FRP/CBL Coated
Angle Seat Strainer DN 200 - DN 400 Inliner FRP/CBL Coated
Manhole mad of FRP and PP/FRP

Plastic pipes

Calculator for cutting pipes
Guidelines for sawing plastic pipe
Leftovers in plastic pipe
Standardization of plastic pipes and molded parts
PVC U pipes deviations
Pressure loss in pipe systems out of PVC U, PVC C and ABS pipe systems
Distinction between Rp, R and G threads
Screw lengths for flange connections

Plastic fittings

PVC U transparent ball valves
Diaphragm valves
Block valves
Butterfly valves
Plastic needle valves


Plastic Valves according to ATEX

New EU guideline 2014/34/EU
Plastic Valves in EX zones
Y-Strainers PP-EL DN 15 - DN 50
Check valves PP-EL DN 15 - DN 50
Angle seat valves PP-EL DN 15 - DN 50

Bonding of plastic pipes

Bonding manual
Video showing the bonding of pipes

Plastic welding

Guidelines for extrusion welding

Grids / support grids

GFK grids
Grids out of PP -el electrically conductive
Profile support grids out of PP -el electrically conductive

Molded ventilation parts

Ventilation technology

Chemical hose

PVC transparent hose with fabric inlay

Industrial tanks and chemical containers

Dosing tanks and outer containers 35 – 1000 Liter
Salt dissolving tanks 60 -5000 Liter
Storage tanks and vats
Storage tanks for water
Safety and collecting troughs
Industrial tank delivery program
Dosing tanks with agitator
Dosing tank agitators
Dosing tanks with attachments
Dosing tanks made of sheet material
Customized chemical containers
Dosing tanks with level indicators



IBC screw caps DN 150/DN 200
IBC adapters out of PE
IBC adapters out of PP

Attachment parts for tank construction

Vapor separators
CO2 - absorbes
Revision nozzles
Block flange

Filter housings and filter cartridges

PENTEK 3G Slime Line filter housings
PENTEK 3G Standard filter housings
PENTEK Big Blue filter housings
PENTEK PP high temperature filter housings
PENTEK PP all nature filter housings
PENTEK filter bags for Big Blue filter housings
PENTEK surface filter cartridges
PENTEK filter cartridges for depth filtration
PENTEK filter cartridges with activated carbon
CINTROPUR filter systems
CINTROPUR water filters

Flange configurator

Blind flanges, loose flanges,  rectangular flanges

Chemical resistance

Table of chemical resistance for plastic pipe systems

Machined plastic parts

Screw-in parts
Threaded fittings
Screw fittings

Milled plastic parts

Loose flanges and blind flanges made of sheet material

Static mixers

Static mixers made of plastic


Single-type and double-type strainers
Pot strainer DN 300
Angle seat strainer DN 500

Flow meters

Variable area flow meters
Configuration tool for flow meters

Filter presses

Laboratory filter presses

Injection molded parts

Scraper made of PE for filter press

Kwerk Practice Blog

The Kwerk team blogs from the field here

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